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Electric Power Steering System

A technology of electric power steering and steering angle, which is applied in the direction of electric steering mechanism, power steering mechanism, automatic steering control components, etc., and can solve problems such as offset

Active Publication Date: 2014-10-22
JTEKT CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In other words, there is a possibility that the steering angle based on the motor angle detection value may deviate from the actual steering angle due to the steering angle when the motor midpoint is obtained.

Method used

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  • Electric Power Steering System
  • Electric Power Steering System

Examples

Experimental program
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Embodiment Construction

[0012] Hereinafter, an embodiment of an electric power steering system (EPS) will be described with reference to the drawings.

[0013] Such as figure 1 As shown, EPS1 includes a steering shaft 3 and a rack shaft 5 . A steering wheel 2 is fixed to the steering shaft 3 . The rack shaft 5 reciprocates in the axial direction corresponding to the rotation of the steering shaft 3 . In addition, the steering shaft 3 is configured by sequentially connecting a steering column shaft 7 , an intermediate shaft 8 , and a gear shaft 9 from the steering wheel 2 side.

[0014] The rack shaft 5 and the pinion shaft 9 are arranged to have a predetermined intersection angle. The first rack-and-pinion mechanism 11 can be configured by meshing the first rack teeth 5 a formed on the rack shaft 5 with the first gear teeth 9 a formed on the pinion shaft 9 . Tie rods 12 are connected to both ends of the rack shaft 5 . The front end of the tie rod 12 is connected to an unillustrated knuckle in wh...

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PUM

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Abstract

An EPS (1) includes a first rack and pinion mechanism (11) that converts rotation of a pinion shaft (9) due to a steering operation, to reciprocating motion of a rack shaft (5); and a steering force assist device (21) that applies a motor torque of a motor (23) as an assist force by using a second rack and pinion mechanism (27); and an ECU (22) that controls an operation of the steering force assist device (21). Rack teeth (5a) of the rack shaft (5) constituting the first rack and pinion mechanism (11) are formed so that a steering gear ratio is changed depending on a steering angle. The ECU (22) computes a motor neutral point by subtracting a conversion value from a motor angle detection value. The conversion value is computed based on a steering angle detection value by referring to a conversion map that is set taking into account the steering gear ratio corresponding to the steering angle.

Description

[0001] This application claims the priority of Japanese Patent Application No. 2013-087658 filed on April 18, 2013, and uses the entire contents including the specification, drawings, and abstract here. technical field [0002] The present invention relates to a rack and pinion electric power steering device. Background technique [0003] Conventionally, in an electric power steering (EPS) using a motor as a driving source, there is a device provided with a steering sensor that detects the steering angle generated at the steering wheel using an absolute angle exceeding 360° (for example, Japanese Patent Laid-Open 2012-21890 Bulletin). Such a steering sensor generally has a lower resolution than a relative angle sensor such as a resolver that detects the rotation angle of a motor (motor angle) using a relative angle in a range of 360°. Therefore, the value of the motor angle at the steering neutral position (motor midpoint) is often obtained based on the detection value of t...

Claims

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Application Information

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IPC IPC(8): B62D6/00B62D5/04
CPCB62D15/0235B62D5/0421B62D15/0245B62D5/0457B62D3/126B62D5/0409B62D5/046B62D5/0466
Inventor 喜多政之青野慎也
Owner JTEKT CORP